WO2017169868A1 - Élément de stockage d'électricité - Google Patents

Élément de stockage d'électricité Download PDF

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Publication number
WO2017169868A1
WO2017169868A1 PCT/JP2017/010812 JP2017010812W WO2017169868A1 WO 2017169868 A1 WO2017169868 A1 WO 2017169868A1 JP 2017010812 W JP2017010812 W JP 2017010812W WO 2017169868 A1 WO2017169868 A1 WO 2017169868A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
current collector
electrode terminal
container
terminal
Prior art date
Application number
PCT/JP2017/010812
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English (en)
Japanese (ja)
Inventor
瞬 伊藤
Original Assignee
株式会社Ｇｓユアサ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Priority to JP2018509030A priority Critical patent/JP6806142B2/ja
Publication of WO2017169868A1 publication Critical patent/WO2017169868A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to a power storage device including a container, an electrode terminal, an electrode body, and a current collector that connects the electrode terminal and the electrode body.
  • a power storage device having a container, an electrode terminal, an electrode body, and a current collector, in which the current collector is connected to the electrode terminal and the electrode body is connected to the current collector, has been widely known (for example, , See Patent Document 1).
  • the conventional power storage device has a problem that the electrode body may be shaken and damaged in the container due to external vibration or impact.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a storage element that can firmly support an electrode body in a container.
  • a power storage element is a power storage element including a container, an electrode terminal, an electrode body, and a current collector that connects the electrode terminal and the electrode body.
  • a third connection portion that is a connection portion between the fixed portion and the first connection portion is disposed between the second connection portion and the third connection portion.
  • the electrode body can be firmly supported in the container.
  • FIG. 1 is a perspective view schematically showing the external appearance of the energy storage device according to the embodiment of the present invention.
  • FIG. 2 is a perspective view showing components disposed inside the container of the energy storage device according to the embodiment of the present invention.
  • FIG. 3 is a cross-sectional view showing a configuration around the lid of the container according to the embodiment of the present invention.
  • FIG. 4 is a perspective view showing the configuration of the electrode body according to the embodiment of the present invention.
  • FIG. 5 is a cross-sectional perspective view showing configurations of the positive electrode terminal, the positive electrode current collector, and the intermediate member according to the embodiment of the present invention.
  • FIG. 6 is a perspective view showing the configuration of the positive electrode current collector according to the embodiment of the present invention.
  • FIG. 1 is a perspective view schematically showing the external appearance of the energy storage device according to the embodiment of the present invention.
  • FIG. 2 is a perspective view showing components disposed inside the container of the energy storage device according to the embodiment of the present invention.
  • FIG. 3 is
  • FIG. 7 is a perspective view showing the configuration of the intermediate member according to the embodiment of the present invention.
  • FIG. 8 is a perspective view showing a step of arranging the positive electrode terminal and the negative electrode terminal according to the embodiment of the present invention on the lid.
  • FIG. 9 is a cross-sectional view illustrating a process of attaching the positive electrode current collector and the negative electrode current collector according to the embodiment of the present invention to the positive electrode terminal, the negative electrode terminal, and the container lid.
  • FIG. 10 is a cross-sectional view illustrating a process of connecting the positive electrode current collector and the negative electrode current collector according to the embodiment of the present invention to the electrode body.
  • FIG. 11 is a perspective view showing a configuration of a power storage device according to a modification of the embodiment of the present invention.
  • FIG. 12 is a cross-sectional view showing a third connection portion of the positive electrode current collector and a fixing portion of the intermediate member according to a modification of the embodiment of the present invention.
  • the conventional power storage device has a problem that the electrode body may be shaken and damaged in the container due to external vibration or impact.
  • the conventional power storage device has a configuration in which the current collector is connected to the electrode terminal on one end side and connected to the electrode body on the other end side to support the electrode body, so that vibration, impact, etc. from the outside As a result, the electrode body may be shaken in the container and damaged.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a storage element that can firmly support an electrode body in a container.
  • a power storage element is a power storage element including a container, an electrode terminal, an electrode body, and a current collector that connects the electrode terminal and the electrode body.
  • a third connection portion that is a connection portion between the fixed portion and the first connection portion is disposed between the second connection portion and the third connection portion.
  • the current collector fixes the current collector to the container, the first connection portion that is a connection portion with the electrode body, the second connection portion that is a connection portion with the electrode terminal, and the current collector. It has the 3rd connection part which is a connection part with a fixed part, and the 1st connection part is arranged between the 2nd connection part and the 3rd connection part. That is, the current collector is configured such that the connection portion with the electrode body is disposed between the connection portion with the electrode terminal and the connection portion with the fixed portion. Thereby, since the electrode body is supported between the electrode terminal and the fixing portion by the current collector in the container, the electrode body can be firmly supported in the container.
  • first connection portion, the second connection portion, and the third connection portion may be arranged on the same side of the electrode body.
  • an electrode body is an electrode. It can support still more firmly between a terminal and a fixed part.
  • the fixing portion may be an insulating member that penetrates at least one of the container and the current collector and fixes the current collector to the container.
  • the fixing part is an insulating member that passes through at least one of the container and the current collector and fixes the current collector to the container
  • the insulating fixing part causes the container and the current collector to It is possible to have two functions of fixing the container and insulating the container and the current collector.
  • the container, the electrode terminal, and the fixing portion may be integrated together with an insulating member disposed between the container and the electrode terminal.
  • the electrode terminal and the fixing portion are insulated while insulating the container and the electrode terminal. Can be easily fixed to the container.
  • the current collector may have a through-hole into which the fixing portion is inserted in the third connection portion, and the through-hole may be made larger as it is closer to the tip of the fixing portion.
  • the through hole into which the fixing portion is inserted has a larger shape as it is closer to the tip of the fixing portion.
  • the power storage device includes a plurality of the electrode bodies and the current collector connected to each of the plurality of electrode bodies, and each of the current collectors has the through hole.
  • the through hole may be larger as the through hole of the current collector near the tip of the fixed portion.
  • the through hole closer to the tip of the fixing part among the through holes of the plurality of current collectors has a larger shape, and thus is fixed in the plurality of through holes by heat caulking or the like.
  • the direction in which the current collectors, electrode terminals or side spacers are arranged, or the opposing direction of the short side surface of the container is defined as the X-axis direction.
  • the opposing direction of the long side surface of the container, the short side direction of the short side surface of the container, or the thickness direction of the container is defined as the Y-axis direction.
  • the vertical direction of the power storage element (the direction in which gravity acts in the installed state), the winding axis direction of the electrode body of the power storage element, or the longitudinal direction of the short side surface of the container is defined as the Z-axis direction.
  • X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect (orthogonal in this embodiment).
  • the Z-axis direction may not be the vertical direction, and the Z-axis direction is not limited to the vertical direction.
  • the Z-axis direction will be described as the vertical direction below. To do.
  • the X axis direction plus side indicates the arrow direction side of the X axis
  • the X axis direction minus side indicates the opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.
  • FIG. 1 is a perspective view schematically showing an external appearance of a power storage device 10 according to an embodiment of the present invention.
  • FIG. 2 is a perspective view showing components arranged inside container 100 of power storage element 10 according to the embodiment of the present invention.
  • FIG. 3 is a perspective view showing a configuration in a state where the container body 111 and the side spacers 510 and 520 are separated from the power storage element 10.
  • FIG. 3 is a cross-sectional view showing a configuration around the lid 110 of the container 100 according to the embodiment of the present invention.
  • FIG. 2 is a diagram showing a cross section when the configuration shown in FIG. 2 is cut along a plane parallel to the XZ plane including the line III-III. In FIG. 3, the electrode body 400 is not cut (not sectioned) and only the upper part is shown.
  • the electricity storage element 10 is a secondary battery that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery.
  • the electric storage element 10 is applied to an automobile power source such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), an electronic device power source, an electric power storage power source, and the like.
  • the storage element 10 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, a capacitor, or a battery that is charged by a user. It is also possible to use a primary battery that can use stored electricity even if it is not.
  • a rectangular box-shaped (square) power storage element 10 is illustrated, but the shape of the power storage element 10 is not limited, and may be a columnar shape, a long columnar shape, or the like. Also, a laminate type power storage element can be provided.
  • the storage element 10 includes a container 100, a positive electrode terminal 200, a negative electrode terminal 300, an electrode body 400, side spacers 510 and 520, a positive electrode current collector 600, and a negative electrode current collector. 800 and intermediate members 700 and 900.
  • the electrode body 400, the side spacers 510 and 520, the positive electrode current collector 600, and the negative electrode current collector 800 are accommodated inside the container 100, and the positive electrode terminal 200, the negative electrode terminal 300, and the intermediate member.
  • a part of each of 700 and 900 is accommodated inside the container 100.
  • a gas discharge valve for releasing the pressure when the pressure in the container 100 rises, or an insulating sheet that wraps the electrode body 400 and the like may be disposed.
  • a liquid injection hole for injecting an electrolytic solution is formed in the container 100, and the electrolytic solution (nonaqueous electrolyte) and the like are enclosed inside the container 100, but the illustration is omitted.
  • the said electrolyte solution does not impair the performance of the electrical storage element 10
  • the container 100 includes a container main body 111 having a rectangular cylindrical shape and a bottom, and a lid 110 that is a plate-like member that closes the opening of the container main body 111.
  • the container 100 can be hermetically sealed by welding the lid body 110 and the container body 111 after the electrode body 400 and the side spacers 510 and 520 are accommodated therein.
  • the material of the lid body 110 and the container body 111 is not particularly limited, and for example, a weldable metal such as stainless steel, aluminum, or an aluminum alloy can be used, but a resin can also be used.
  • the electrode body 400 includes a positive electrode plate, a negative electrode plate, and a separator, and is a power storage element (power generation element) that can store electricity.
  • the electrode body 400 is formed by winding what is arranged in layers so that a separator is sandwiched between a positive electrode plate and a negative electrode plate.
  • the electrode body 400 includes a tab portion 410 formed by stacking the protruding portions of the positive electrode plate and a tab portion 420 formed by stacking the protruding portions of the negative electrode plate. The detailed description of the configuration of the electrode body 400 will be described later.
  • an elliptical shape is illustrated as a cross-sectional shape of the electrode body 400, but an elliptical shape, a circular shape, a polygonal shape, or the like may be used.
  • the electrode body 400 is not limited to a winding type, and may be a stack type in which a plurality of flat plate plates are stacked, a shape in which the electrode plates are folded in a bellows shape, or the like.
  • the positive electrode terminal 200 is an electrode terminal electrically connected to the positive electrode plate of the electrode body 400 via the positive electrode current collector 600, and the negative electrode terminal 300 is connected to the electrode body 400 via the negative electrode current collector 800.
  • the electrode terminal is electrically connected to the negative electrode plate. That is, the positive electrode terminal 200 and the negative electrode terminal 300 lead the electricity stored in the electrode body 400 to the external space of the power storage element 10, and in order to store the electricity in the electrode body 400, It is an electrode terminal made of metal for introducing.
  • the positive electrode terminal 200 and the negative electrode terminal 300 are attached to the lid body 110 disposed above the electrode body 400.
  • the positive electrode terminal 200 and the negative electrode terminal 300 are fixed to the lid body 110 by being integrated (integrally formed) with the lid body 110 together with the intermediate members 700 and 900. That is, the lid 110 and the positive terminal 200 are integrated (integrated) with the intermediate member 700 disposed between the lid 110 and the positive terminal 200.
  • the lid body 110 and the negative electrode terminal 300 are integrated (integrated) with the intermediate member 900 disposed between the lid body 110 and the negative electrode terminal 300. A detailed description of the configuration of the positive electrode terminal 200 and the negative electrode terminal 300 will be described later.
  • the positive electrode current collector 600 is a member that is disposed between the lid body 110 and the electrode body 400 and has electrical conductivity and rigidity that are electrically connected to the positive electrode terminal 200 and the positive electrode plate of the electrode body 400.
  • the negative electrode current collector 800 is disposed between the lid body 110 and the electrode body 400, and has a conductivity and rigidity that are electrically connected to the negative electrode terminal 300 and the negative electrode plate of the electrode body 400. It is. That is, the positive electrode current collector 600 and the negative electrode current collector 800 are arranged on the same side (upper side) of the electrode body 400.
  • the positive electrode current collector 600 includes a first connection portion 610 that is a connection portion with the electrode body 400, a second connection portion 620 that is a connection portion with the positive electrode terminal 200, and an intermediate member 700 described later. And a third connection portion 630 which is a connection portion with the fixing portion 760.
  • the positive electrode current collector 600 is fixedly connected (bonded) to the positive electrode terminal 200 at one end, the intermediate member 700 having the other end connected to the lid 110, and the tab portion 410 of the electrode body 400 at the center.
  • the negative electrode current collector 800 includes a first connection portion 810 that is a connection portion with the electrode body 400, a second connection portion 820 that is a connection portion with the negative electrode terminal 300, and a fixing portion of the intermediate member 900. And a third connection portion 830 which is a connection portion with 960. That is, the negative electrode current collector 800 is fixedly connected (joined) to the negative electrode terminal 300 at one end, the intermediate member 900 having the other end connected to the lid 110, and the tab portion 420 of the electrode body 400 at the center. )
  • the electrode body 400 is held (supported) in a state of being suspended from the lid body 110 by the positive electrode current collector 600 and the negative electrode current collector 800, and vibration due to vibration or impact is suppressed.
  • the material of the positive electrode current collector 600 is not limited.
  • the positive electrode current collector 600 is formed of a metal such as aluminum or an aluminum alloy, as in a positive electrode base material layer of the electrode body 400 described later.
  • the material of the negative electrode current collector 800 is not limited, but is formed of a metal such as copper or a copper alloy, for example, as in the negative electrode base material layer of the electrode body 400 described later. A detailed description of the configuration of the positive electrode current collector 600 and the negative electrode current collector 800 will be described later.
  • the intermediate member 700 is at least partially disposed between the lid 110, the positive electrode terminal 200, and the positive electrode current collector 600, and insulates the lid 110 from the positive electrode terminal 200 and the positive electrode current collector 600. It is an insulating member such as.
  • the intermediate member 900 is at least partially disposed between the lid 110, the negative electrode terminal 300, and the negative electrode current collector 800, and insulates the lid 110 from the negative electrode terminal 300 and the negative electrode current collector 800. It is an insulating member such as resin.
  • the intermediate member 700 is integrated with the lid 110 and the positive electrode terminal 200, and the intermediate member 900 is integrated with the lid 110 and the negative electrode terminal 300, and also has a function of maintaining the airtightness of the container 100.
  • the intermediate member 700 holds the positive electrode terminal 200 with a part of the positive electrode terminal 200 exposed.
  • the intermediate member 900 holds the negative electrode terminal 300 with a part of the negative electrode terminal 300 exposed.
  • the intermediate member 700 is integrally formed with the lid 110 and the positive terminal 200 by, for example, insert molding.
  • the intermediate member 900 is integrally formed with the lid body 110 and the negative electrode terminal 300 by, for example, insert molding. Therefore, the intermediate member 700 and the intermediate member 900 are resin members formed from a resin that can be insert-molded.
  • the resin used for the intermediate members 700 and 900 examples include polyphenylene sulfide (PPS), polypropylene (PP), polyethylene (PE), polybutylene terephthalate (PBT), polyamide, perfluoroalkoxyalkane (PFA), A phenol resin etc. are mentioned.
  • the resin member is not only one type of resin material, but also a combination of a plurality of resin materials, a combination of a resin material and an elastomer material, and a particulate or fibrous inorganic material in the resin material. You may form from what was added.
  • the intermediate members 700 and 900 are preferably formed of members having rigidity lower than that of the lid body 110.
  • the intermediate member 700 does not need to insulate the lid 110 from the positive electrode terminal 200 and the positive electrode current collector 600, or may not have an insulating property when insulated by other members. Absent. For example, when the container 100 is electrically connected to the positive electrode terminal 200 and the positive electrode current collector 600 (that is, the container 100 is dropped to the positive electrode potential), the intermediate member 700 may not have insulating properties. . The same applies to the intermediate member 900. A detailed description of the configuration of the intermediate members 700 and 900 will be described later.
  • the side spacers 510 and 520 are spacers disposed on both sides of the electrode body 400 in the X-axis direction, and serve to insulate the electrode body 400 from the container 100 and regulate the position of the electrode body 400.
  • the side spacer 510 is a member that covers the side surface of the electrode body 400 on the minus side in the X-axis direction, the end portion of the upper surface, and the end portion of the lower surface
  • the side spacer 520 is the X-axis direction of the electrode body 400. It is a member that covers the side surface on the plus side, the end of the upper surface, and the end of the lower surface.
  • the side spacers 510 and 520 are formed of an insulating material such as polycarbonate (PC), PP, PE, or PPS, for example.
  • FIG. 4 is a perspective view showing the configuration of the electrode assembly 400 according to the embodiment of the present invention. In the figure, a part of the wound state of the electrode body 400 is shown in a developed manner.
  • the electrode body 400 is formed by alternately stacking and winding positive and negative plates 430 and 440 and separators 450a and 450b. That is, the electrode body 400 is formed by laminating the positive electrode plate 430, the separator 450a, the negative electrode plate 440, and the separator 450b in this order and winding the cross section into an oval shape. Yes.
  • the positive electrode plate 430 is an electrode plate in which a positive electrode active material layer is formed on the surface of a positive electrode base material layer that is a long strip-shaped metal foil made of aluminum or an aluminum alloy.
  • a positive electrode active material used for a positive electrode active material layer if it is a positive electrode active material which can occlude / release lithium ion, a well-known material can be used suitably.
  • a positive electrode active material a polyanion compound such as LiMPO 4 , LiMSiO 4 , LiMBO 3 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.), lithium titanate, Spinel compounds such as lithium manganate, lithium transition metal oxides such as LiMO 2 (M is one or more transition metal elements selected from Fe, Ni, Mn, Co, etc.) and the like can be used.
  • the negative electrode plate 440 is an electrode plate in which a negative electrode active material layer is formed on the surface of a negative electrode base material layer that is a long strip-shaped metal foil made of copper or a copper alloy.
  • a negative electrode active material used for a negative electrode active material layer if it is a negative electrode active material which can occlude-release lithium ion, a well-known material can be used suitably.
  • lithium metal lithium metal
  • lithium alloy lithium metal-containing alloys such as lithium-aluminum, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy
  • lithium Alloys that can be occluded / released
  • carbon materials eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon, amorphous carbon, etc.
  • metal oxides lithium metal oxides (Li 4 Ti 5 O 12 etc.)
  • polyphosphoric acid compounds e.g, lithium metal, lithium alloy (lithium metal-containing alloys such as lithium-aluminum, lithium-lead, lithium-tin, lithium-aluminum-tin, lithium-gallium, and wood alloy), and lithium Alloys that can be occluded / released
  • carbon materials eg, graphite, non-graphitizable carbon, graphitizable carbon, low-temperature calcined carbon
  • Separator 450a and 450b are microporous sheets made of resin.
  • a well-known material can be used suitably as long as it does not impair the performance of the electrical storage element 10.
  • the positive electrode plate 430 has a plurality of protruding portions 431 protruding outward at one end in the winding axis direction.
  • the negative electrode plate 440 has a plurality of protruding portions 441 that protrude outward at one end in the winding axis direction.
  • the plurality of protrusions 431 and the plurality of protrusions 441 are portions where the active material layer is not formed (the active material is not applied) and the base material layer is exposed (active material layer non-forming portion).
  • the winding axis is a virtual axis serving as a central axis when winding the positive electrode plate 430, the negative electrode plate 440, and the like. In this embodiment, the winding axis extends in the Z-axis direction passing through the center of the electrode body 400. Parallel straight lines.
  • the plurality of protrusions 431 and the plurality of protrusions 441 are arranged at the same end in the winding axis direction (in the figure, the end on the plus side in the Z-axis direction), and the positive electrode plate 430 and the negative electrode plate 440 are provided.
  • the electrode body 400 is laminated at a predetermined position.
  • the plurality of protrusions 431 are stacked at predetermined positions in the circumferential direction at one end in the winding axis direction by stacking the positive electrode plate 430 by winding.
  • the plurality of protrusions 441 are stacked at a predetermined position in the circumferential direction different from the position where the plurality of protrusions 431 are stacked at one end in the winding axis direction by stacking the negative electrode plate 440 by winding. Laminated.
  • the electrode body 400 is formed with a tab portion 410 formed by stacking a plurality of protrusions 431 and a tab portion 420 formed by stacking a plurality of protrusions 441.
  • the tab part 410 is gathered toward the center in the stacking direction, for example, and joined to the first connection part 610 of the positive electrode current collector 600.
  • the tab part 420 is gathered together toward the center of the lamination direction, for example, and is joined with the 1st connection part 810 of the negative electrode collector 800.
  • the joining between the tab portion 410 and the first connecting portion 610 and the joining between the tab portion 420 and the first connecting portion 810 are, for example, welding joining such as laser welding, resistance welding, ultrasonic welding, caulking, etc. Any method such as mechanical joining may be used. From the viewpoint of suppressing the generation of metal powder (contamination), mechanical joining is preferable.
  • the tab portions (410, 420) are portions for introducing and deriving electricity in the electrode body 400, and other names such as “lead (portion)” and “current collector” may be attached. is there.
  • the positive electrode terminal 200, the negative electrode terminal 300, the positive electrode current collector 600, the negative electrode current collector 800, and the intermediate members 700 and 900 will be described in detail.
  • the positive electrode terminal 200, the positive electrode current collector 600, and the intermediate member 700, and the negative electrode terminal 300, the negative electrode current collector 800, and the intermediate member 900 have the same configuration, the positive electrode terminal 200,
  • the configuration of the positive electrode current collector 600 and the intermediate member 700 will be described, and the description of the configuration of the negative electrode terminal 300, the negative electrode current collector 800, and the intermediate member 900 will be omitted or simplified.
  • FIG. 5 is a cross-sectional perspective view showing the configuration of the positive electrode terminal 200, the positive electrode current collector 600, and the intermediate member 700 according to the embodiment of the present invention. Specifically, this figure is an enlarged perspective view showing the configuration of the positive electrode terminal 200, the positive electrode current collector 600, and the intermediate member 700 shown in FIG. In FIG. 5, the electrode body 400 is shown without being cut (not in a cross section), as in FIG. 3.
  • FIG. 6 is a perspective view showing a configuration of positive electrode current collector 600 according to the embodiment of the present invention.
  • FIG. 7 is a perspective view showing the configuration of the intermediate member 700 according to the embodiment of the present invention.
  • the positive electrode current collector 600 includes a first connection portion 610, a second connection portion 620, a third connection portion 630, a first connection portion 640, and a second connection portion 650. And have.
  • the positive electrode current collector 600 is disposed above the electrode body 400 (Z-axis direction plus side). That is, the 1st connection part 610, the 2nd connection part 620, the 3rd connection part 630, the 1st connection part 640, and the 2nd connection part 650 are arrange
  • the first connection portion 610 is a connection portion with the electrode body 400, and is a rectangular and flat portion that is disposed in the central portion of the positive electrode current collector 600 and is parallel to the XZ plane and extends in the X-axis direction. It is. Specifically, the first connection portion 610 is disposed between the second connection portion 620 and the third connection portion 630 and is connected (fixed) to the tab portion 410 of the electrode body 400.
  • the second connection portion 620 is a connection portion with the positive electrode terminal 200, and is a flat portion parallel to the XY plane and disposed at the end on the negative side in the X-axis direction of the positive electrode current collector 600.
  • the second connecting portion 620 is formed with an opening 620a which is a circular through hole.
  • the second connection portion 620 is connected (fixed) to the positive electrode terminal 200 by inserting the positive electrode terminal 200 into the opening 620 a and caulking the tip of the positive electrode terminal 200.
  • the opening 620a is not limited to a circular shape, and may be, for example, an elliptical shape, an oval shape, or a polygonal shape. Further, the opening 620a is not limited to the through hole, and may be a notch cut into a semicircular shape or a rectangular shape.
  • the third connection portion 630 is a connection portion with the fixing portion 760 of the intermediate member 700 described later, and is a flat plate parallel to the XY plane that is disposed at the end on the positive side of the positive electrode current collector 600 in the X-axis direction. It is a part.
  • the third connection portion 630 is formed with an opening 630a which is a circular through hole.
  • the third connecting portion 630 is connected (fixed) to the fixing portion 760 by inserting the fixing portion 760 into the opening 630a and caulking the tip of the fixing portion 760 with heat.
  • the opening 630a is not limited to a circular shape, and may be, for example, an elliptical shape, an oval shape, or a polygonal shape. Further, the opening 630a is not limited to the through hole, and may be a notch cut into a semicircular shape or a rectangular shape.
  • the 1st connection part 640 is a site
  • the 2nd connection part 650 is a site
  • the first connection portion 610 is not limited to a portion parallel to the XZ plane, and may be a portion parallel to the XY plane, for example.
  • the first connection portion 610 can be arranged in parallel to the XY plane.
  • the 1st connection part 640 and the 2nd connection part 650 are not twisted shape, but become a flat part.
  • the positive electrode terminal 200 includes a terminal main body portion 210, a first shaft portion 220, a second shaft portion 230, and a caulking portion 240.
  • the positive electrode terminal 200 is an integral object. That is, the positive electrode terminal 200 is a single continuous member formed by integrating the terminal main body portion 210, the first shaft portion 220, the second shaft portion 230, and the caulking portion 240.
  • the terminal main body 210 is a flat portion constituting the main body of the positive electrode terminal 200 disposed on the positive electrode terminal 200, and is connected to an external conductive member such as a bus bar. Specifically, the terminal main body 210 is disposed above the lid 110 and inside the intermediate member 700, and is joined to the bus bar by welding. That is, the upper surface of the terminal main body 210 is exposed from the intermediate member 700, and the bus bar is welded to the upper surface.
  • the connection form between the terminal body 210 and the bus bar is not particularly limited.
  • the terminal body 210 may have a bolt part, and the terminal body 210 and the bus bar may be connected by fastening the bolt with a nut.
  • the first shaft portion 220 is a columnar portion that penetrates the lid 110 and is disposed in the center portion of the positive electrode terminal 200. Specifically, the first shaft portion 220 is disposed between the terminal body portion 210 and the second shaft portion 230 so as to be connected to the terminal body portion 210 and the second shaft portion 230. Further, the first shaft portion 220 is inserted into an opening 110 a (see FIG. 8) that is a circular through hole formed in the lid 110, and is disposed so as to be surrounded by the intermediate member 700. .
  • the shape of the first shaft portion 220 is not limited to a cylindrical shape, and may be, for example, an elliptical column shape, a long column shape, or a polygonal column shape. In this case, it is preferable that the opening 110 a of the lid 110 has a shape corresponding to the outer shape of the first shaft portion 220. Further, the opening 110a is not limited to the through hole, and may be a semicircular or rectangular cutout.
  • the second shaft portion 230 is a columnar portion that passes through the second connection portion 620 of the positive electrode current collector 600 and is disposed below the positive electrode terminal 200.
  • the second shaft portion 230 is a cylindrical portion having a smaller diameter than the first shaft portion 220, and the first shaft portion 220 and the caulking portion are interposed between the first shaft portion 220 and the caulking portion 240. 240 is connected to and arranged.
  • the second shaft portion 230 is inserted and disposed in the opening 620 a of the second connection portion 620.
  • the shape of the 2nd axial part 230 is not limited to a column shape, For example, an elliptical column shape, a long column shape, a polygonal column shape etc. may be sufficient. In this case, it is preferable that the opening 620 a of the second connection portion 620 has a shape corresponding to the outer shape of the second shaft portion 230.
  • the caulking portion 240 is a disc-shaped portion disposed at the lower end portion of the positive electrode terminal 200 and is disposed below the second connection portion 620 of the positive electrode current collector 600.
  • the caulking portion 240 is a portion formed by plastic deformation by caulking the lower end portion of the positive electrode terminal 200 (lower end portion of the second shaft portion 230). That is, the positive electrode terminal 200 penetrates the lid body 110, the intermediate member 700, and the positive electrode current collector 600, and the tip end portion thereof is caulked so that the second connection portion 620 of the positive electrode current collector 600 is connected to the positive electrode terminal 200 and the lid body. 110 is fixed.
  • the caulking portion 240 may be formed by caulking a solid shaft portion, or may be formed by caulking a hollow shaft portion.
  • the material of the positive electrode terminal 200 is not limited, For example, like the positive electrode base material layer of the electrode body 400, it forms with metals, such as aluminum or aluminum alloy.
  • the material of the negative electrode terminal 300 is not limited, but is formed of a metal such as copper or a copper alloy, for example, similarly to the negative electrode base material layer of the electrode body 400.
  • the positive electrode terminal 200 or the negative electrode terminal 300 may be composed of a plurality of members.
  • the terminal body is preferably formed of aluminum or an aluminum alloy from the viewpoint of ease of welding with the bus bar and cost reduction.
  • the terminal body portion is formed of aluminum or an aluminum alloy, and other portions (the first shaft portion, the second shaft portion, and the caulking portion) are formed of copper or a copper alloy. It is preferable.
  • the intermediate member 700 has a function of a sealing member (gasket) disposed at least partially between the lid 110 and the positive electrode terminal 200 and the positive electrode current collector 600, and is integrated with the lid 110 and the positive electrode terminal 200. It has become.
  • the intermediate member 700 includes a first intermediate part 710, a second intermediate part 720, a third intermediate part 730, a fourth intermediate part 740, a fifth intermediate part 750, And a fixing portion 760.
  • the intermediate member 700 is an integral body made of a resin member. That is, the intermediate member 700 is formed by integrating the first intermediate portion 710, the second intermediate portion 720, the third intermediate portion 730, the fourth intermediate portion 740, the fifth intermediate portion 750, and the fixing portion 760. It is one continuous member.
  • the first intermediate portion 710 is an annular portion disposed on the outer periphery of the terminal main body 210 so as to wrap the terminal main body 210 of the positive electrode terminal 200 from the periphery. That is, the first intermediate portion 710 is a wall that surrounds the entire circumference of the terminal main body 210 and is disposed in close contact with the entire circumference. The first intermediate portion 710 can ensure insulation from other members around the terminal main body 210 and can prevent the terminal main body 210 from rotating around the first shaft portion 220. Yes.
  • the second intermediate part 720 is an oval and flat part disposed below the first intermediate part 710 and between the lid 110 and the terminal main body part 210. Specifically, the second intermediate portion 720 is disposed in close contact with the upper surface of the lid 110 and the lower surface of the terminal main body 210. As a result, the second intermediate portion 720 insulates the lid 110 and the terminal main body 210 and fills the gap between the lid 110 and the terminal main body 210 to prevent leakage (that is, airtightness and The liquid-tightness can be improved.
  • an oval convex portion 110b (see FIG. 8) is formed at a position where the second intermediate portion 720 on the upper surface of the lid 110 is disposed.
  • the 2nd intermediate part 720 has an elliptical recessed part fitted with this convex part 110b.
  • the recess prevents the second intermediate portion 720 from rotating around the first shaft portion 220, thereby suppressing the first intermediate portion 710 and the terminal body portion 210 from rotating around the first shaft portion 220. Is able to.
  • the shape of the convex part 110b and the said recessed part is not limited to an ellipse shape, What kind of shape, such as a circular shape, an ellipse shape, and a polygonal shape, may be sufficient.
  • the third intermediate portion 730 is a cylindrical portion disposed on the outer periphery of the first shaft portion 220 so as to surround the first shaft portion 220 of the positive electrode terminal 200 from the periphery below the second intermediate portion 720. . Specifically, the third intermediate portion 730 is disposed in the opening 110 a of the lid 110 in close contact with the inner surface of the opening 110 a and the outer surface of the first shaft portion 220. As a result, the third intermediate portion 730 can insulate the lid 110 and the first shaft portion 220, and can prevent leakage by filling the gap between the lid 110 and the first shaft portion 220. ing.
  • the fourth intermediate portion 740 is disposed below the third intermediate portion 730 and between the lid 110 and the second connection portion 620 of the positive electrode current collector 600 and surrounds the first shaft portion 220 from the periphery. As described above, it is a substantially oval and flat plate portion disposed on the outer periphery of the first shaft portion 220. Specifically, the fourth intermediate portion 740 is disposed in close contact with the lower surface of the lid 110, the upper surface of the second connection portion 620, and the outer surface of the first shaft portion 220. As a result, the fourth intermediate portion 740 insulates the lid 110 from the first shaft portion 220 and the second connection portion 620, and between the lid body 110, the first shaft portion 220 and the second connection portion 620.
  • the ellipse-shaped convex part fitted to the convex part 110b from the downward direction is formed in the fourth intermediate part 740. Is formed.
  • the fifth intermediate part 750 is a flat part extending from the fourth intermediate part 740 to the plus side in the X-axis direction, and is disposed between the lid 110 and the first connection part 610 of the positive electrode current collector 600. Specifically, the fifth intermediate portion 750 is disposed in close contact with the lower surface of the lid 110. Thereby, the fifth intermediate portion 750 can insulate the lid 110 from the first connection portion 610.
  • the fixing part 760 is a part that is connected to the fifth intermediate part 750 at a position sandwiching the fifth intermediate part 750 with the fourth intermediate part 740. That is, the fixing part 760 is not an independent member but a part of the intermediate member 700.
  • the lid 110, the positive electrode terminal 200, and the fixing portion 760 are integrated together with an insulating member disposed between the lid 110 and the positive electrode terminal 200.
  • the fixing portion 760 is a portion that fixes the third connection portion 630 of the positive electrode current collector 600 to the lid body 110. That is, the fixing portion 760 is an insulating member that penetrates the lid body 110 and the third connection portion 630 and fixes the third connection portion 630 to the lid body 110.
  • the positive electrode terminal 200, the positive electrode current collector 600, and the fixing portion 760 are disposed on the same surface (lid body 110) of the container 100.
  • the fixing portion 760 includes a fixing portion end portion 761, a fixing portion shaft portion 762, and a heat caulking portion 763.
  • the fixed portion end 761 is a top portion of the fixed portion 760 and is a disk-shaped portion disposed above the lid 110. That is, the fixed portion end portion 761 is disposed in close contact with the upper surface of the lid body 110 and prevents leakage from the opening 110c (see FIG. 8) that is a circular through hole formed in the lid body 110. At the same time, it is possible to prevent the fixing portion 760 from falling downward from the lid 110.
  • the opening 110c is not limited to a circular shape, and may be, for example, an elliptical shape, an oval shape, or a polygonal shape. Further, the opening 110c is not limited to the through hole, and may be a notch cut into a semicircular shape or a rectangular shape.
  • the fixed portion shaft portion 762 is a substantially cylindrical portion that is inserted and disposed in the opening portion 110c of the lid body 110 and the opening portion 630a of the third connection portion 630 of the positive electrode current collector 600.
  • the fixed portion shaft portion 762 has a flange portion 762 a that is an annular projecting portion at the center position, and the flange portion 762 a is disposed between the lid 110 and the third connection portion 630.
  • the flange portion 762 a is a portion that connects the fixed portion 760 and the fifth intermediate portion 750 and is formed to be connected to the fifth intermediate portion 750.
  • the cover body 110 and the 3rd connection part 630 can be insulated.
  • fixed part 760 is closely_contact
  • the outer shape of the fixed portion shaft portion 762 is the shape of the opening 110c and the opening 630a. The corresponding shape.
  • the heat caulking portion 763 is a disc-shaped portion disposed at the lower end portion of the fixing portion 760 and is disposed below the third connection portion 630 of the positive electrode current collector 600.
  • the heat caulking portion 763 is a portion formed by plastic deformation by caulking (thermally welding) the lower end portion of the fixing portion 760 (the lower end portion of the fixing portion shaft portion 762). . That is, the fixing portion 760 is in close contact with the third connection portion 630 by the end portion being caulked, and fixes the third connection portion 630 to the lid 110.
  • FIG. 8 is a perspective view showing a process of arranging the positive terminal 201 and the negative terminal 301 on the lid 110 according to the embodiment of the present invention.
  • FIG. 9 is a cross-sectional view illustrating a process of attaching the positive electrode current collector 600 and the negative electrode current collector 800 according to the embodiment of the present invention to the positive electrode terminal 200 and the negative electrode terminal 300 and the lid body 110 of the container 100. is there.
  • FIG. 10 is a cross-sectional view showing a process of connecting the positive electrode current collector 600 and the negative electrode current collector 800 according to the embodiment of the present invention to the electrode body 400.
  • the positive terminal 201 and the negative terminal 301 are arranged with respect to the lid 110.
  • the positive electrode terminal 201 is a member showing a state before being deformed into the positive electrode terminal 200 (before being crimped), and does not have the caulking portion 240 as compared with the positive electrode terminal 200, and the second It has a shape in which the tip of the shaft portion 230 extends.
  • the positive electrode terminal 201 also has the terminal main-body part 210 and the 1st axial part 220, since it is the same as that of the structure which the positive electrode terminal 200 has, detailed description is abbreviate
  • the positive terminal 201 is arranged at a predetermined position of the lid 110 with the first shaft portion 220 and the second shaft portion 230 inserted into the opening 110 a of the lid body 110. Is done. 9 (a) to 9 (d) show the positive electrode side, the same applies to the negative electrode side.
  • an intermediate member 700a is formed around the positive terminal 201 and the lid 110.
  • the mold is arranged from both the upper and lower directions of the positive electrode terminal 201 and the lid body 110, and the resin is injected into the gap between the mold, the positive electrode terminal 201 and the lid body 110, and the intermediate member 700a is formed. Is done. That is, the intermediate member 700a including the first intermediate portion 710, the second intermediate portion 720, the third intermediate portion 730, the fourth intermediate portion 740, the fifth intermediate portion 750, and the fixing portion 760a is formed by insert molding.
  • the fixing portion 760a is a member that shows a state before being deformed to the fixing portion 760 described above (before being caulked), and does not have the heat caulking portion 763 as compared with the fixing portion 760, and thus the fixing portion.
  • the shaft portion 762 has a shape in which the distal end extends. In this way, the lid body 110 and the positive electrode terminal 201 are integrated together with the intermediate member 700 a disposed between the lid body 110 and the positive electrode terminal 201.
  • the positive electrode current collector 600 is disposed below the positive electrode terminal 201 and the lid body 110. Specifically, the second shaft portion 230 of the positive electrode terminal 201 is inserted into the opening portion 620a of the second connection portion 620, and the fixing portion shaft portion of the fixing portion 760a is inserted into the opening portion 630a of the third connection portion 630. 762 is inserted.
  • the positive electrode current collector 600 is fixed to the positive electrode terminal 200 and the lid body 110.
  • the caulking portion 240 is formed by caulking the tip end portion of the second shaft portion 230 of the positive electrode terminal 201, and the second connection portion 620 is fixed to the positive electrode terminal 200.
  • the end of the fixed portion shaft portion 762 of the fixing portion 760a is caulked (heat caulked) to form a heat caulking portion 763, and the third connecting portion 630 is fixed to the fixing portion 760.
  • the step of fixing the second connection portion 620 to the positive terminal 200 or the step of fixing the third connection portion 630 to the fixing portion 760 may be performed first or simultaneously.
  • the positive electrode current collector 600 and the negative electrode current collector 800 are fixed to the electrode body 400.
  • the first connection portion 610 of the positive electrode current collector 600 and the first connection portion 810 of the negative electrode current collector 800 are joined to the tab portion 410 and the tab portion 420 of the electrode body 400.
  • the positive electrode current collector 600 is fixed to the positive electrode terminal 200 and the lid body 110 (fixed portion 760 connected to the positive electrode terminal 200 and the third connection portion 630) in the second connection portion 620 and the third connection portion 630.
  • the electrode body 400 is supported by the portion 610.
  • the negative electrode current collector 800 is fixed to the negative electrode terminal 300 and the lid body 110 (fixed portion 960 connected to) in the second connection portion 820 and the third connection portion 830, and in the first connection portion 810.
  • the electrode body 400 is supported.
  • positive electrode current collector 600 has first connection portion 610, second connection portion 620, and third connection portion 630.
  • the first connection part 610 is disposed between the second connection part 620 and the third connection part 630. That is, the positive electrode current collector 600 is configured such that the connection portion with the electrode body 400 is disposed between the connection portion with the positive electrode terminal 200 and the connection portion with the fixing portion 760.
  • the electrode body 400 can be firmly supported in the container 100. .
  • the 1st connection part 610, the 2nd connection part 620, and the 3rd connection part 630 are arrange
  • the fixing portion 760 is an insulating member that penetrates the container 100 and the positive electrode current collector 600 and fixes the positive electrode current collector 600 to the container 100, the insulating fixing portion 760 causes the container 100 and the positive electrode current collector to be fixed. Two functions of fixing the current collector 600 and insulating the container 100 and the positive electrode current collector 600 can be performed.
  • the container 100 and the positive electrode terminal 200 are insulated while the positive electrode is insulated.
  • the terminal 200 and the fixing part 760 can be easily fixed to the container 100.
  • the negative electrode side has the same configuration as that of the positive electrode side, the same effect can be obtained.
  • the power storage element 10 includes only one set of the electrode body 400 and the current collector (the positive electrode current collector 600 and the negative electrode current collector 800). However, in this modification, the power storage element includes a plurality of sets of electrode bodies and current collectors. Although the configuration on the positive electrode side will be described below, the negative electrode side has the same configuration as the positive electrode side.
  • FIG. 11 is a perspective view showing a configuration of a power storage device according to a modification of the embodiment of the present invention.
  • positive electrode current collectors 601 to 603 and electrode bodies 401 to 403 of the electricity storage device according to the present modification are shown, and other members are not shown.
  • FIG. 12 is a cross-sectional view showing third connection portions 631 to 633 of positive electrode current collectors 601 to 603 and fixing portion 770 of intermediate member 700 according to a modification of the embodiment of the present invention.
  • FIG. 11 is a cross-sectional view showing a process of fixing the positive electrode current collectors 601 to 603 shown in FIG.
  • a power storage device includes a plurality of electrode bodies 401 to 403 and positive electrode current collectors 601 to 603 connected to the plurality of electrode bodies 401 to 403, respectively.
  • the electrode body 401 has a tab portion 411
  • the electrode body 402 has a tab portion 412
  • the electrode body 403 has a tab portion 413.
  • the electrode bodies 401 to 403 have the same configuration as the electrode body 400 in the above embodiment.
  • the positive electrode current collector 601 includes a first connection portion 611, a second connection portion 621, and a third connection portion 631
  • the positive electrode current collector 602 includes a first connection portion 612, a second connection portion 622, and the like.
  • the positive electrode current collector 603 includes a first connection portion 613, a second connection portion 623, and a third connection portion 633.
  • the first connection portion 611 is connected to the tab portion 411
  • the first connection portion 612 is connected to the tab portion 412
  • the first connection portion 613 is connected to the tab portion 413.
  • the positive electrode current collectors 601 to 603 are connected to the fixing portion 770 at the third connection portions 631 to 633.
  • the positive electrode current collectors 601 to 603 have openings 631a to 633a which are circular through holes in the third connection portions 631 to 633. Yes.
  • the fixed portion shaft portion 771a of the fixed portion 770a is inserted into the openings 631a to 633a.
  • the distal end portion of the fixed portion shaft portion 771a is caulked by heat, and the fixed portion shaft portion 771a is deformed into a fixed portion shaft portion 771 and a heat caulked portion 772 (plastic deformation).
  • a fixing portion 770 is formed, and the third connection portions 631 to 633 of the positive electrode current collectors 601 to 603 are fixed to the fixing portion 770.
  • the opening 631a has a tapered shape (conical shape) that is larger as it is closer to the heat caulking portion 772 disposed at the tip of the fixing portion 770.
  • the openings 632a and 633a have a tapered shape (conical shape) that is larger as the heat caulking part 772 is closer.
  • the openings 631a to 633a are formed to be larger as the openings of the positive electrode current collector near the heat caulking portion 772 are formed. That is, the opening 632a is formed larger than the opening 631a, and the opening 633a is formed larger than the opening 632a.
  • the cylindrical fixed portion shaft portion 771a expands in the openings 631a to 633a during heat caulking, and is deformed into a truncated cone-shaped fixed portion shaft portion 771 having a larger diameter as the heat caulking portion 772 is closer. Is done.
  • the 2nd connection part 621, the 2nd connection part 622, and the 2nd connection part 623 are connected to the positive electrode terminal 200 similarly to the said embodiment. Further, the other configurations are the same as those in the above embodiment. However, in this modification, unlike the above embodiment, after the electrode bodies 401 to 403 and the positive electrode current collectors 601 to 603 are connected, the positive electrode current collectors 601 to 603 are connected to the positive electrode terminal 200 and the fixing portion 770. It is preferable to connect.
  • the openings 631a to 633a each have a shape that increases as the tip of the fixing portion 770 approaches. have. For this reason, each of the positive electrode current collectors 601 to 603 can be prevented from coming off from the fixing portion 770 by expanding the front end side of the fixing portion 770 in the openings 631a to 633a by heat caulking or the like.
  • the openings 631a to 633a included in the plurality of positive electrode current collectors 601 to 603 have a shape that is larger as the opening is closer to the tip of the fixed part 770. For this reason, it is possible to prevent the plurality of positive electrode current collectors 601 to 603 from coming off the fixing portion 770 by expanding the distal end side of the fixing portion 770 within the plurality of openings 631a to 633a by heat caulking or the like.
  • the openings 631a to 633a may not have a tapered shape (conical truncated cone shape) with a uniform change in diameter but may have a surface with a non-uniform change in diameter.
  • the openings 631a to 633a are straight (cylindrical) openings, and the opening closer to the tip of the fixing portion 770 may have a larger diameter. This also can prevent the plurality of positive electrode current collectors 601 to 603 from coming off the fixing portion 770.
  • the third connection portion of the positive electrode current collector includes An opening having a larger shape may be formed closer to the tip of the fixed portion. Also by this, it can suppress that one positive electrode electrical power collector pulls out from a fixing
  • the positive electrode terminal, the positive electrode current collector, the negative electrode terminal, and the negative electrode current collector are attached to the lid 110 of the container 100.
  • at least one of the positive electrode terminal, the positive electrode current collector, the negative electrode terminal, and the negative electrode current collector is attached to a wall portion (any wall portion of the container body 111) other than the lid body 110 of the container 100. It does not matter if it is configured.
  • the lid body 110 and the positive electrode terminal 200 are integrated with the intermediate member 700 by insert molding.
  • the intermediate member 700 is a resin member formed from a resin that can be insert-molded. However, it may be integrated by a technique other than insert molding, such as painting resin, or may not be integrated.
  • the intermediate member 700 may be a member other than resin. The same applies to the negative electrode side.
  • the positive electrode terminal 200 is fixed to the positive electrode terminal 200 and the lid body 110 by caulking the tip.
  • the method of fixing the positive electrode current collector to the positive electrode terminal 200 and the lid body 110 does not have to be caulking.
  • welding joining such as laser welding, resistance welding, ultrasonic welding, or a bolt part and a nut part It can be a sign. The same applies to the negative electrode side.
  • the fixing part of the intermediate member 700 fixes the positive electrode current collector to the lid 110 by heat caulking.
  • the method of fixing the positive electrode current collector to the lid 110 does not have to be heat caulking.
  • the fixing part is welded to the positive electrode current collector, or a bolt part is formed on the fixing part and fastened to the nut part. It does not matter even if it is a technique to do. The same applies to the negative electrode side.
  • the fixing portion of the intermediate member 700 penetrates both the lid 110 and the positive electrode current collector.
  • the fixing portion does not need to penetrate both the lid 110 and the positive electrode current collector, and penetrates at least one of the lid 110 and the positive electrode current collector to fix the positive electrode current collector to the lid 110.
  • Any configuration may be used.
  • a configuration in which the fixing portion passes through the lid body 110 and holds the positive electrode current collector therebetween is conceivable.
  • a configuration in which the fixing portion does not penetrate through the lid body 110 because the end portion is embedded in the lid body 110 is also conceivable.
  • the fixing portion may be configured to fix the positive electrode current collector to the lid 110 without penetrating both the lid 110 and the positive electrode current collector. The same applies to the negative electrode side.
  • the fixing portion is a part of the insulating member (intermediate member 700) disposed between the lid 110 and the positive electrode terminal 200.
  • the fixing portion may be a member independent of the insulating member (intermediate member 700). The same applies to the negative electrode side.
  • the intermediate members 700 and 900 each have a different fixing
  • the electrode body has a tab portion, and the tab portion is connected to the first connection portion of the positive electrode current collector.
  • the electrode body may not have a tab portion, and an active material layer non-forming portion may be disposed at an end portion.
  • the first connection portion of the positive electrode current collector since the first connection portion of the positive electrode current collector has a shape extending toward the electrode body, it can be connected (joined) to the end portion of the electrode body.
  • both the positive electrode side and the negative electrode side have the above-described configuration.
  • at least one of the positive electrode side and the negative electrode side has the above-described configuration.
  • the present invention can be realized not only as such a power storage element, but also as a current collector (positive electrode current collector, negative electrode current collector) provided in the power storage element, or a fixing portion of the intermediate members 700 and 900 Can also be realized.
  • the present invention can be applied to a power storage element that can firmly support an electrode body in a container.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

L'invention concerne un élément de stockage d'électricité (10) qui comprend : un contenant (100) ; une borne d'électrode positive (200) ; un corps à électrodes (400) ; et un collecteur d'électrode positive (600) qui connecte la borne d'électrode positive (200) et le corps à électrodes (400), une partie de fixation (760) étant utilisée pour fixer le collecteur d'électrode positive (600) au contenant (100). Le collecteur d'électrode positive (600) comprend : une première partie de connexion (610) destinée à être connectée au corps à électrodes (400) ; une deuxième partie de connexion (620) destinée à être connectée à la borne d'électrode positive (200) ; et une troisième partie de connexion (630) destinée à être connectée à la partie de fixation (760). La première partie de connexion (610) est agencée entre la deuxième partie de connexion (620) et la troisième partie de connexion (630).
PCT/JP2017/010812 2016-03-29 2017-03-16 Élément de stockage d'électricité WO2017169868A1 (fr)

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JP2016-066294 2016-03-29

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012160274A (ja) * 2011-01-31 2012-08-23 Panasonic Corp 二次電池
JP2013105671A (ja) * 2011-11-15 2013-05-30 Toyota Industries Corp 二次電池、車両、及び二次電池の製造方法
WO2014042005A1 (fr) * 2012-09-12 2014-03-20 株式会社Ｇｓユアサ Dispositif de stockage d'électricité et processus pour fabriquer un dispositif de stockage d'électricité
JP2015046301A (ja) * 2013-08-28 2015-03-12 トヨタ自動車株式会社 二次電池
WO2015097785A1 (fr) * 2013-12-25 2015-07-02 日立オートモティブシステムズ株式会社 Batterie secondaire rectangulaire
WO2017038439A1 (fr) * 2015-09-01 2017-03-09 株式会社 豊田自動織機 Dispositif de stockage d'électricité
JP2017062986A (ja) * 2015-09-25 2017-03-30 株式会社豊田自動織機 蓄電装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012160274A (ja) * 2011-01-31 2012-08-23 Panasonic Corp 二次電池
JP2013105671A (ja) * 2011-11-15 2013-05-30 Toyota Industries Corp 二次電池、車両、及び二次電池の製造方法
WO2014042005A1 (fr) * 2012-09-12 2014-03-20 株式会社Ｇｓユアサ Dispositif de stockage d'électricité et processus pour fabriquer un dispositif de stockage d'électricité
JP2015046301A (ja) * 2013-08-28 2015-03-12 トヨタ自動車株式会社 二次電池
WO2015097785A1 (fr) * 2013-12-25 2015-07-02 日立オートモティブシステムズ株式会社 Batterie secondaire rectangulaire
WO2017038439A1 (fr) * 2015-09-01 2017-03-09 株式会社 豊田自動織機 Dispositif de stockage d'électricité
JP2017062986A (ja) * 2015-09-25 2017-03-30 株式会社豊田自動織機 蓄電装置

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